servlet中施用spring

servlet中使用spring
	ServletContext application;
		WebApplicationContext wac;
		application = getServletContext();
		wac = WebApplicationContextUtils.getWebApplicationContext(application);// 获取spring的context
		BaseDaoImpl user = (BaseDaoImpl) wac.getBean("baseDaoImpl");
		byte[] b = user.getBlob("{2d712e35-2be6-46cf-b702-1f47468d6042}", 5,
				133, 28);
		PrintWriter out = response.getWriter();
		out.print(b);
		out.flush();